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Matched-filtering line search methods applied to Suzaku data

机译:匹配过滤线搜索方法应用于朱雀数据

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A detailed search for emission and absorption lines and an assessment of their upper limits are performed for Suzaku data. The method utilizes a matched-filtering approach to maximize the signal-to-noise ratio for a given energy resolution, which could be applicable to many types of line search. We first applied it to well-known active galactic nuclei spectra that have been reported to have ultra-fast outflows, and find that our results are consistent with previous findings at the similar to 3 sigma level. We proceeded to search for emission and absorption features in two bright magnetars 4U 0142+61 and 1RXS J1708-4009, applying the filtering method to Suzaku data. We found that neither source showed any significant indication of line features, even using long-term Suzaku observations or dividing their spectra into spin phases. The upper limits on the equivalent width of emission/absorption lines are constrained to be a few eV at similar to 1 keV and a few hundreds of eV at similar to 10 keV. This strengthens previous reports that persistently bright magnetars do not show proton cyclotron absorption features in soft X-rays and, even if they exist, they would be broadened or much weaker than below the detection limit of X-ray CCD.
机译:对于朱雀数据,将对发射和吸收线进行详细搜索并对其上限进行评估。该方法利用匹配滤波方法来针对给定的能量分辨率最大化信噪比,这可能适用于多种类型的线搜索。我们首先将其应用于众所周知的活跃银河原子核光谱,该光谱据报道具有超快的流出,并且发现我们的结果与以前的发现在3 sigma的水平上是一致的。我们将滤波方法应用于Suzaku数据,以搜索两个明亮的磁星4U 0142 + 61和1RXS J1708-4009的发射和吸收特征。我们发现,即使使用长期的Suzaku观测或将其光谱划分为自旋相,也没有一个源显示出线特征的任何明显迹象。发射/吸收线的等效宽度的上限被限制为与1 keV类似的几个eV和与10 keV类似的数百eV。这加强了以前的报道,即持续亮的磁星在软X射线中不显示质子回旋加速器吸收特征,即使存在,它们也将比X射线CCD的检测极限以下加宽或弱得多。

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